WEBVTT Kind: captions; Language: en

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[...]

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hey mute what's the big idea of busting
up my act why mute i am a new man haven't

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you heard about the wonderful thing dr.
weston did for me he kept up my post gave

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me a set of vocal cords you ought to see
him take it from me you'll never land a

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job the way you are let's go here we are

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hello talkie what's on your mind now my old

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friend you want you to put him through the

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works why man you still run on 60 we'll
have to pep you up to 90 open your mouth

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yeah come right along with me now
talkie let's put on an act permit

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him follow us through

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[...] why oh oh oh oh oh oh oh oh oh oh
oh oh oh go the heart be will be [...] of

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claim inside this booth is a motion
picture camera which is taking pictures

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through this window we use a soundproof
booth when it's closed it keeps the

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camera noise away from the microphone
the camera is operated by a motor which

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runs at exactly the same speed as the
motor in the sound machine woooo it's hot

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in this booth let's get out on the set
again and I'll show how the sound is

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picked up by the microphones on the
stage sound waves are picked up by this

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wonderful mechanical ear the microphone
which is really a glorified telephone

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transmitter this microphone changes the
sound waves into electrical vibrations

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which are amplified here and sent along
these wires to the mixer room the sounds

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from the stage microphones are mixed here
so that the central for the action in

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the production mr. mixer sees the actors
through this window and hears them only

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through this horn now that we've got
the sound right I'll show you how it's

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amplified get ready

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the power from the microphones is
amplified about 10 million times by these

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vacuum tubes making the voice current
strong enough to operate the machine that

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photographs the sound do you follow me

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this is the machine that is used
to record the sound on film

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this sound film is traveling
at the same rate of speed as

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the picture film in the camera booth the
light valve has two thin metal strings

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stretched across this tiny slit on one
side of the slit is a strong light while

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on the other is a film moving at exactly
the same speed as the picture camera in

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the studio the greatly amplified voice
current passing through these tiny light

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valve strings move them closer together
or further apart thus changing the size

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of the slit therefore the light varies as
it passes through this rapidly changing

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opening leaving a true photographic
record of the voice currents on the film

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simple illness now let's look at the
films after they've been developed

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well here we are here are our
two negatives developed the next

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step is to print these two negatives onto
a third piece of film we'll print the

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sound record first and then
the picture record here we

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have a completed sound print and
we are now ready for projection

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this is the picture and sound projector

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one motor drives both the
picture and sound equipment you

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see let me illustrate this with a simple
diagram this lamp illuminates the

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soundtrack on the film the light from the
lamp passes through the slit throwing a

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very narrow line of brilliant light on
the soundtrack as the film runs past this

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light the marks on the soundtrack cause
the light to increase and decrease this

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light in turn causes the current through
the photoelectric cell to increase and

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decrease thus reproducing the electric
vibrations first created by the sound wave

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the current from the photoelectric cell
is peped up by the amplifier and then

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this amplified current is carried
by wires along through the theater

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and down to the screen on the stage
to connect with the loudspeakers

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this is a typical layout of the stage
set with two horns behind the screen the

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receivers connected to the horns convert
the electrical vibrations back into

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sound waves exactly the way the telephone
receiver operates so that while the

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picture is being shown the sound
which was recorded is reproduced

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in step with the picture

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the screen is full of small holes so
that the horns may be placed behind the

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screen to let the sound through this gives
the illusion that the sound is coming

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from the image of the speaker

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talking there goes your cue your next on
screen while music and go try on his new

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voice okay [...] fall that wide

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look when whoopee I found
my voice ha ha ha let me

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into that machine no you can't go out
now Tucky's doing his stuff I can't a

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professor you'll get one to me

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look here smarty if you must stay on the
screen with me suppose we get together

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with a little close harmony what do you
say my lady we're going to leave you now

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my lady my lady